the whole point of breeding is to improve what youv gotWhat the man is saying if you need to better your own dogs don't breed off them buy in off better dogsso if iv a first x collie lurcher that needs a bit more poke,,i should go to someone elsei have a 1/2 x bull x gh i am putting my beddy whippet GH over it just to ad more poke and i think the pups would be better for it